Allied 1C21T-0028-FB Spade Drill Insert 7/8 in Solid Carbide Tin

Product Description

The ALLIED MACHINE AND ENGINEERING 1C21T-0028-FB is a solid carbide spade drill insert designed for high-performance hole-making in demanding materials. With a 7/8 inch diameter, a 180-degree point angle, and a Physical Vapor Deposition (PVD) TiN coating, this insert delivers consistent cutting performance and extended tool life. It belongs to the T-A Series and is sized to Seat Size 1. The C2 (K20) carbide grade provides the hardness and wear resistance required for production drilling applications. Installation and use is typical for machining centers, CNC lathes, and drill presses operated by machinists and tool-and-die professionals.

This insert is engineered for drilling into a broad range of workpiece materials including stainless steel, cast iron, non-ferrous metals, super-alloys, and titanium. The T-A Series is a well-established spade drill platform commonly used in production machining environments where consistent hole quality and insert replaceability are required. The TiN PVD coating reduces built-up edge and improves chip flow when working through harder or more abrasive materials. Package quantity is 1 insert per package with a minimum order quantity of 2.

Key Features

• 7/8 inch diameter, Seat Size 1, T-A Series spade drill insert
• Solid carbide construction with C2 (K20) manufacturer grade for high hardness and wear resistance
• 180-degree point angle for flat-bottom entry and reduced thrust force
• PVD TiN coating reduces friction, extends tool life, and resists built-up edge
• Compatible with stainless steel, cast iron, non-ferrous metals, super-alloys, and titanium workpieces
• Fractional inch measurement system; 0.1563 inch insert thickness

Compatibility

Designed for use with T-A Series Seat Size 1 spade drill holders as specified by Allied Machine and Engineering. Verify holder seat size and series designation before installation.

Installation Notes

This insert is installed and replaced by qualified machinists or tooling technicians following the machine tool manufacturer's lockout and de-energization procedures before any tooling change. Ensure the holder seat is clean and free of chips or debris before seating the insert. Use the correct insert screw torque procedure as specified in the Allied T-A Series holder documentation. Inspect the seat and insert pocket for wear at each insert change to maintain hole-size accuracy.